Adobe Flash Player versions 25.0.0.171 and earlier have an exploitable memory corruption vulnerability in the PNG image parser. Successful exploitation could lead to arbitrary code execution.
https://www.exploit-db.com/exploits/42248/
https://security.gentoo.org/glsa/201707-15
https://helpx.adobe.com/security/products/flash-player/apsb17-17.html
https://access.redhat.com/errata/RHSA-2017:1439